I had a prop valve that leaked just like yours. I never found any way to repair it. I ended up replacing the unit. Problem solved !!

I always mark the unit and the knob at the closed (left) and open (right) position . I then mark at the adjusted position. It helps me remember in case I ever need to change the adjustment.

Right or wrong, I count the number of turns from the closed position (left) to the open position (right). Turn the knob slowly and softly.

I then turn to the closed (left) position and turn to the right 60%. That has always been a good starting point for me. Not all cars will be the same, so adjust it as you need to and good luck.

I would like to hear any other comments about this. Bring them on guys !!

I hope this helps.

454 RATTLER

Yesterday when I posted this I was sure that the open and closed positions were correct. Not I'm not too sure. Be sure to check your valve for which is open and closed. Then adjust to 60% and start from there.